Low insert loss bilayer graphene compact twin-core optical fiber intensity modulator

Abstract

A compact modulator with high bandwidth and extinction ratio is proposed to achieve light intensity modulation by adjusting the phase of the light transmitted in the fiber. The better modulation effect is achieved by placing two-lamellae of graphene embedded in Al2O3and PVB on a side-polished microfiber of MZM. Finite element software is used to analyze the modulation effect, the function of the chemical potential of graphene and the effective refractive of modulator is established. Extinction ratios of port 1 and port 2 can reach 11.54 dB and 11.88 dB in 92 μm by substituting the function into simulation. While achieving a more compact modulation structure, the insert loss is also controlled below 0.0193 dB/μm. For the first time, the contact width between bilayer graphene and the electrode is increased by placing the electrode at the head and end of the modulator, which leads to 132.427 GHz modulation bandwidth. And the modulator does not require the excess support structure necessarily benefit from the placement of the electrode. The proposed phase-shift light intensity modulator has high extinction ratio and large bandwidth, which leads to great transmission capacity and modulate speed.